Boeing's LWF design was rated very highly in the LWF competition. It has been suggested it came second in the evaluation to General Dynamics Model 401 (F-16), but Northrop's P-610 was given the second contract because it was twin engined and hence represented a different approach. Boeing's design was too similar to General Dynamics'.

The last pic is obviously a different design/derivative, because of the blending. I think it looks better than the non-blended version, IMHO. Do we know which of the designs shown was the actual submission? I would guess the non-blended design, since it's a full scale mock-up, but I was just curious about that.

Is that a full size mock-up? Although I guess it shares the semi-reclined seating arrangement of the F-16 the cockpit seems too shallow to fit the pilots legs, rudder pedals and any other avionics in the nose. It would be a very tight squeeze taking references from the man standing beside it.

Thanks to Tony Buttler's American Secret Projects we can confirm that the model illustrates Boeing Model 908-618, an earlier study, while the mockup and 3 view is the later 908-909 design. Unfortunately no dimensions are given.

The earlier design with the LERX is the Boeing 908-618. Model 908-618-2 was featured in Riccioni, Boyd and Sprey's "Falcon Brief" presentation.

Apparently, Boeing were unable to converge a workable design for the LERX so removed it from their 908-909 submission.

Boeing 908-618-2 was 47.8ft in length from tip of pitot tube to end of tail. Excluding the pitot and tail, length was 43ft. Wing span was 29.3ft, tail span 17ft, height 14ft. Wing area was 240 sq ft. Takeoff weight clean was estimated at 16,000lb, empty weight 11,700lb, with provision for 4,300lb internal fuel. Engine was the F100-PW-100.

The lower of three images (with the blended wing) seems to amount to a significant redesign (as a derivative) as the wing appears to have a higher incidence in it's mounting location to "blend" with the nose strakes.